it could be the largest storm ever to hit the united states. forecasters say the center of the storm should make landfall along the new jersey coast later today. it will be colliding with two other weather systems. that could cause a super storm and an 800-mile area from the east coast to the great lakes. if you plan to fly today, call ahead. check first before you head to the airport. thousands of flights have be been cancelled all over the country because of the hurricane. it's expected to have a ripple effect, as you can imagine. ktvu's alex savidge is at san francisco international airport where we're learning that all flights to six east coast cities have been cancelled. what else is going on, alex? >> reporter: well, hurricane sandy is causing some major headaches for travelers in the bay area who are trying to get back to the east coast. let me give you a look at the board here. you can see these flights at new york's jfk airport and newark airport this morning cancelled due to weather as you can see right here. i got an update from the